package com.boot.predicate;

import io.netty.util.internal.StringUtil;
import jakarta.validation.constraints.NotEmpty;
import org.springframework.cloud.gateway.handler.predicate.AbstractRoutePredicateFactory;
import org.springframework.cloud.gateway.handler.predicate.GatewayPredicate;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.server.ServerWebExchange;

import java.util.List;
import java.util.function.Predicate;

@Component
public class VipRoutePredicateFactory extends AbstractRoutePredicateFactory<VipRoutePredicateFactory.Config> {
    public VipRoutePredicateFactory() {
        super(Config.class);
    }
    @Override
    public List<String> shortcutFieldOrder() {
        return List.of("param", "value");
    }

    @Override
    public Predicate<ServerWebExchange> apply(Config config) {
        return new GatewayPredicate() {
            @Override
            public boolean test(ServerWebExchange serverWebExchange) {
                //localhost/search?q=haha&user=leifeng
                String first = serverWebExchange.getRequest().getQueryParams().getFirst(config.param);
                return StringUtils.hasText(first) && first.equals(config.value);
            }
        };
    }

    @Validated
    public static class Config {
        @NotEmpty
        private String param;
        @NotEmpty
        private String value;
    }
}
